Hahah, interesting backstory on that one. Quote from Wikipedia:
In 1932 Random House, which had the rights to publish the entire book in the United States, decided to bring a test case to challenge the de facto ban, so as to publish the work without fear of prosecution. It therefore made an arrangement to import the edition published in France, and to have a copy seized by the U.S. Customs Service when the ship carrying the work arrived. Although Customs had been told in advance of the anticipated arrival of the book, it was not confiscated on arrival, and instead was forwarded on to Random House in New York City. As seizure by Customs was essential to the plan for a test case, Morris Ernst, the attorney for Random House, took the unopened package to Customs, demanded that it be seized, and it was.
https://en.wikipedia.org/wiki/United_States_v._One_Book_Call...